By making a cash donation to The Salvation Army, you are able to claim a charitable deduction of up to 50% of your adjusted gross income in the year you make the gift. If you cannot utilize the entire deduction in that year, deductions may be carried over for an additional five years.
Scientists learn about the layers deep within the Earth's crust by studying how seismic waves travel through the Earth.If there is an earthquake somewhere, seismagraphs in many locations will record it.
We think that since the earth formed all of its layers, that the size hasn't changed too much, but the shape of it has. It has always looked like a ball, but if you look really closely, it's actually a bit flattened at the north and south poles, and it bulges at the equator.